package com.xiangxiangjd.analyse.utils;

import java.security.MessageDigest;

/**
 * @author LF
 * @date 2020/9/29 - 10:57
 */
    public class MD5Util {
        /***
         * MD5加码 生成32位md5码
         */
        public static String string2MD5(String inStr) {
            MessageDigest md5 = null;
            try {
                md5 = MessageDigest.getInstance("MD5");
            } catch (Exception e) {
                System.out.println(e.toString());
                e.printStackTrace();
                return "";
            }
            char[] charArray = inStr.toCharArray();
            byte[] byteArray = new byte[charArray.length];

            for (int i = 0; i < charArray.length; i++) {
                byteArray[i] = (byte) charArray[i];
            }
            byte[] md5Bytes = md5.digest(byteArray);
            StringBuffer hexValue = new StringBuffer();
            for (int i = 0; i < md5Bytes.length; i++) {
                int val = ((int) md5Bytes[i]) & 0xff;
                if (val < 16){
                    hexValue.append("0");
                }
                hexValue.append(Integer.toHexString(val));
            }
            return hexValue.toString();

        }

        /**
         * 加密解密算法 执行一次加密，两次解密
         */
        public static String convertMD5(String inStr) {

            char[] a = inStr.toCharArray();
            for (int i = 0; i < a.length; i++) {
                a[i] = (char) (a[i] ^ 't');
            }
            String s = new String(a);
            return s;

        }

        // 测试主函数
        public static void main(String args[]) {
            String s = "1";
            System.out.println("原始：" + s);
            System.out.println("MD5后：" + string2MD5(s));
            System.out.println("加密的：" + convertMD5(s));
            System.out.println("解密的：" + convertMD5(convertMD5(s)));
        }

    }
